Two young children were killed in a fire at a Lumpkin County home on Monday.

Tuesday morning, Insurance and Fire Commissioner Ralph Hudgens ruled the mobile home fire "undetermined."

"This fire originated on the front porch and burned into the interior of the home," Hudgens said. "Investigators could not rule out careless smoking as the possible cause."

He said the fire did not appear suspicious.

The flames engulfed the home on Rider Road Spur NE, just off of Highway 9, between Dawsonville and Dahlonega just after 4:00 p.m.

Noah Gayden, 2 and his sister Kaylee Gaydon, 1 were taken to North Side Hospital in Cumming and Chestatee Regional Hospital Dahlonega, Ga., where they were both pronounced dead.

The children's mom was in the house when the fire started. Their dad was at the store with another sibling. More on the fire, here.

PHOTOS: Lumpkin County house fire